Math, asked by Adilvrock, 1 year ago

This is question of permutations and combination . can anyone solve this

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Answered by Subh0

1

Series looks like,
1*1!+2*2!+3*3!+4*4!+5*5!+6*6!+7*7!+8*8!+9*9!+10*10!=11!-1
Generalised form (r+1)!-1

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